BiOCl Nanomaterials For The Removal Of As(?) And CIP From Aqueous Solution

The problem of water pollution caused by industrialization is threatening the sustainable development of human society,and also promotes the research and development of water treatment technology.Nanomaterials with dual functions of adsorption and photocatalysis are popular in enhancing the removal of pollutants in water.China is rich in Bi resources,Bi nanomaterials have low toxicity,high stability,high catalytic activity and other characteristics,and are widely used in environmental catalysis,biomedicine and other fields.Among them,Bi OX(X=Cl,Br,I)has been widely studied in the field of photocatalysis due to its unique layered structure,good visible light response and high stability,but its research in the field of adsorption is less,and the performance and internal mechanism of adsorption-photocatalysis synergistic removal of water pollutants has not been reported.To carry out research and mechanism analysis on Bi OX's adsorption and adsorption-photocatalytic synergistic removal of water pollutants.In this paper,heavy metal As(?)and antibiotic ciprofloxacin(CIP)were taken As target pollutants,and the removal performance of target pollutants was improved by structural regulation of nanomaterial Bi OCl.The research contents are as follows:Study on the photocatalytic oxidation of As(?)by Bi OCl synthesized under different hydrothermal time:The removal ability of As(?)was studied by controlling hydrothermal time and considering its energy band structure.In order to achieve the removal of As(?)under neutral and alkaline conditions,BIOCl-8 with three-dimensional flower structure was synthesized by adjusting p H=6,hydrothermal heating for 8 hours,and under the action of surfactant.The material has the characteristics of larger specific surface area,valence band position correction,electron hole separation and faster transmission rate.The photocatalytic oxidation of As(?)was enhanced.Ultrathin Bi OCl nanosheets were synthesized by room temperature precipitation method.Bi₂O₂CO₃ was generated on the surface of Bi OCl nanosheets using the ultrathin Bi OCl nanosheets as precursor and glycol as solvent.Bi OCl/Bi₂O₂CO₃(BOC-E0.2U)heterostructure composite catalyst was constructed.The photocatalytic oxidation of ciprofloxacin(CIP)was further improved.BOC-E0.2U can generate more carriers under the light excitation,and because of the small charge transfer resistance,the photocarriers can migrate quickly and realize the spatial separation of carriers.In addition,BOC-E 0.2U has a strong adsorption capacity for CIP,which is one of the reasons for improving the photocatalytic degradation efficiency.